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lib/crypto: arm64/sha1: Remove obsolete chunking logic

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Since commit aefbab8e77 ("arm64: fpsimd: Preserve/restore kernel mode
NEON at context switch"), kernel-mode NEON sections have been
preemptible on arm64.  And since commit 7dadeaa6e8 ("sched: Further
restrict the preemption modes"), voluntary preemption is no longer
supported on arm64 either.  Therefore, there's no longer any need to
limit the length of kernel-mode NEON sections on arm64.

Simplify the SHA-1 code accordingly.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20260401000548.133151-6-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
This commit is contained in:
Eric Biggers 2026-03-31 17:05:44 -07:00
parent dec1061f0a
commit fd5017138c
2 changed files with 9 additions and 20 deletions
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14
lib/crypto/arm64/sha1-ce-core.S
View File

@ -62,10 +62,10 @@
.endm
/*
* size_t __sha1_ce_transform(struct sha1_block_state *state,
* const u8 *data, size_t nblocks);
* void sha1_ce_transform(struct sha1_block_state *state,
* const u8 *data, size_t nblocks);
*/
SYM_FUNC_START(__sha1_ce_transform)
SYM_FUNC_START(sha1_ce_transform)
/* load round constants */
loadrc k0.4s, 0x5a827999, w6
loadrc k1.4s, 0x6ed9eba1, w6
@ -116,15 +116,11 @@ CPU_LE( rev32 v11.16b, v11.16b )
add dgbv.2s, dgbv.2s, dg1v.2s
add dgav.4s, dgav.4s, dg0v.4s
/* return early if voluntary preemption is needed */
cond_yield 1f, x5, x6
/* handled all input blocks? */
cbnz x2, 0b
/* store new state */
1: st1 {dgav.4s}, [x0]
st1 {dgav.4s}, [x0]
str dgb, [x0, #16]
mov x0, x2
ret
SYM_FUNC_END(__sha1_ce_transform)
SYM_FUNC_END(sha1_ce_transform)

15
lib/crypto/arm64/sha1.h
View File

@ -9,22 +9,15 @@
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
asmlinkage size_t __sha1_ce_transform(struct sha1_block_state *state,
const u8 *data, size_t nblocks);
asmlinkage void sha1_ce_transform(struct sha1_block_state *state,
const u8 *data, size_t nblocks);
static void sha1_blocks(struct sha1_block_state *state,
const u8 *data, size_t nblocks)
{
if (static_branch_likely(&have_ce) && likely(may_use_simd())) {
do {
size_t rem;
scoped_ksimd()
rem = __sha1_ce_transform(state, data, nblocks);
data += (nblocks - rem) * SHA1_BLOCK_SIZE;
nblocks = rem;
} while (nblocks);
scoped_ksimd()
sha1_ce_transform(state, data, nblocks);
} else {
sha1_blocks_generic(state, data, nblocks);
}